Melastoma malabathricum

Purple glory 

Scientific name: Tibouchina urvilleana

Family: Melastomataceae 

it is commonly called princess flower or glory bush

it is a large, dense, rounded-but-sprawling, tropical shrub that typically grows to 6-8' tall, but may reach 15' in optimum growing conditions.

 It can be trained as a small tree or as a vine for growing on an arbor or trellis.

 It is native to rainforests of Brazil. It thrives in southern Florida and along the California coast. 

Reddish, pubescent, somewhat brittle, square branches are clad with serrulate, downy, ovate to ovate-oblong (2-4" long) evergreen leaves, each having 3-7 prominent longitudinal veins. 

Rose-purple flowers (to 3-4" diameter) with purple stamens bloom singly or in clusters in summer. 

In tropical areas, it will bloom sporadically throughout the year. Full bloom is often spectacular. Fruit is a 5-valved capsule.